The National Concrete Masonry Association [NCMA] is a valuable resource for technical information about concrete block. Their e-Tek articles are industry standards for every concrete masonry topic you can think of.
A PDF of the NCMA e-Tek table of contents is embedded below or can be downloaded.
The e-Tek articles are accessed through one of the member websites. So, to access these e-Tek articles follow these 6 steps.